// SPDX-License-Identifier: GPL-2.0-or-later/* * Generic GPIO beeper driver * * Copyright (C) 2013-2014 Alexander Shiyan <shc_work@mail.ru> */ #include <linux/input.h>#include <linux/module.h>#include <linux/gpio/consumer.h>#include <linux/of.h>#include <linux/workqueue.h>#include <linux/platform_device.h> #define BEEPER_MODNAME		"gpio-beeper" struct gpio_beeper {	struct work_struct	work;	struct gpio_desc	*desc;	bool			beeping;}; static void gpio_beeper_toggle(struct gpio_beeper *beep, bool on){	gpiod_set_value_cansleep(beep->desc, on);} static void gpio_beeper_work(struct work_struct *work){	struct gpio_beeper *beep = container_of(work, struct gpio_beeper, work); 	gpio_beeper_toggle(beep, beep->beeping);} static int gpio_beeper_event(struct input_dev *dev, unsigned int type,			     unsigned int code, int value){	struct gpio_beeper *beep = input_get_drvdata(dev); 	if (type != EV_SND || code != SND_BELL)		return -ENOTSUPP; 	if (value < 0)		return -EINVAL; 	beep->beeping = value;	/* Schedule work to actually turn the beeper on or off */	schedule_work(&beep->work); 	return 0;} static void gpio_beeper_close(struct input_dev *input){	struct gpio_beeper *beep = input_get_drvdata(input); 	cancel_work_sync(&beep->work);	gpio_beeper_toggle(beep, false);} static int gpio_beeper_probe(struct platform_device *pdev){	struct gpio_beeper *beep;	struct input_dev *input; 	beep = devm_kzalloc(&pdev->dev, sizeof(*beep), GFP_KERNEL);	if (!beep)		return -ENOMEM; 	beep->desc = devm_gpiod_get(&pdev->dev, NULL, GPIOD_OUT_LOW);	if (IS_ERR(beep->desc))		return PTR_ERR(beep->desc); 	input = devm_input_allocate_device(&pdev->dev);	if (!input)		return -ENOMEM; 	INIT_WORK(&beep->work, gpio_beeper_work); 	input->name		= pdev->name;	input->id.bustype	= BUS_HOST;	input->id.vendor	= 0x0001;	input->id.product	= 0x0001;	input->id.version	= 0x0100;	input->close		= gpio_beeper_close;	input->event		= gpio_beeper_event; 	input_set_capability(input, EV_SND, SND_BELL); 	input_set_drvdata(input, beep); 	return input_register_device(input);} #ifdef CONFIG_OFstatic const struct of_device_id gpio_beeper_of_match[] = {	{ .compatible = "gpio-beeper", },	{ }};MODULE_DEVICE_TABLE(of, gpio_beeper_of_match);#endif static struct platform_driver gpio_beeper_platform_driver = {	.driver	= {		.name		= BEEPER_MODNAME,		.of_match_table	= of_match_ptr(gpio_beeper_of_match),	},	.probe	= gpio_beeper_probe,};module_platform_driver(gpio_beeper_platform_driver); MODULE_LICENSE("GPL");MODULE_AUTHOR("Alexander Shiyan <shc_work@mail.ru>");MODULE_DESCRIPTION("Generic GPIO beeper driver");